
    <nz-tree
      [nzData]="nodes"
      nzDraggable="true"
      (nzExpandChange)="nzAction($event)"
      [nzBeforeDrop]="beforeDrop"
      (nzOnDragStart)="nzAction($event)"
      (nzOnDragEnter)="nzAction($event)"
      (nzOnDragLeave)="nzAction($event)"
      (nzOnDrop)="nzAction($event)"
      (nzOnDragEnd)="nzAction($event)">
    </nz-tree>
  